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In some cases, it is desired to have an unequal distribution of the tolerances between the clearance holes and the threaded holes. In these cases, the total amount of tolerance resulting from the fixed fastener formula is distributed unequally.
Analogous Trait
A trait shared by different species due to convergent evolution, not because of a shared ancestry, producing similar structures independently.
Monophyletic Group
A group of organisms that consists of all the descendants of a common ancestor, representing a single branch on the tree of life.
Ancestor
An organism from which others have descended.
Convergent Evolution
The process by which unrelated or distantly related organisms evolve similar body forms, coloration, organs, or adaptations, often due to similar environmental pressures.
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